Victor, redo your test at 12" from the bottom of the bulb to the top of the sensor, trying to compare anything else is useless as there are to many factors that affect it and even 1" difference can be a lot.. and his readings at 27" were about tripple what your readings at 24" , but what I would expect with your lighting is a very high short distance reading with a rapid fall off in intensity..
this is what my results were with overdriving. my daylight tubes put out more power than my PC's at 6" but at the bottom of my tank thye PC's were twice the level of the overdriven tubes. this is the big reason I decided not to overdrive, even though you an increase the power.. the intensity and potential for penatration isn't there.
I am trying to standerdize all my testing to 12" (thats between bottom of the bulb and the top of the sensor), I feel this is far enuf to get away from the over heating from the bulb and is a depth that is easaly obtainable in most tanks.
To me 3" is a useless measurment as well as 20ish " I just did thoes on Brads tank for a comparason of his bubs as they age.. I think his bulbs were fairly new.
the older one was 3 months I think.
Steve
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